CN106052189A - Cold and hot water system of heat-recovery air-cooled heat pump and oil return control method thereof - Google Patents
Cold and hot water system of heat-recovery air-cooled heat pump and oil return control method thereof Download PDFInfo
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- CN106052189A CN106052189A CN201610377708.8A CN201610377708A CN106052189A CN 106052189 A CN106052189 A CN 106052189A CN 201610377708 A CN201610377708 A CN 201610377708A CN 106052189 A CN106052189 A CN 106052189A
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- valve
- valve port
- heat
- heat exchanger
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
- F25B29/003—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02743—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using three four-way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2103—Temperatures near a heat exchanger
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
Abstract
The invention discloses a cold and hot water system of a heat-recovery air-cooled heat pump. The cold and hot water system of the heat-recovery air-cooled heat pump comprises a compressor, a gas-liquid separator, a first heat exchanger, a second heat exchanger, a heat-recovery heat exchanger, a first four-way valve, a second four-way valve and a third four-way valve. An outlet of the compressor communicates with a first valve port of the first four-way valve, a first valve port of the second four-way valve and a first valve port of the third four-way valve. An inlet of the compressor communicates with an outlet of the gas-liquid separator. An inlet of the gas-liquid separator communicates with a third valve port of the first four-way valve, a third valve port of the second four-way valve and a third valve port and a fourth valve port of the third four-way valve. A second valve port of the first four-way valve and a second valve port of the second four-way valve communicate with a first valve port of the second heat exchanger. A first one-way valve is arranged on a pipeline enabling the first four-way valve and the second heat exchanger to communicate, and a water inlet of the first one-way valve communicates with the second valve port of the first four-way valve. The idling heat exchangers in all modes of the system are always located on the high-pressure side, and thus the risk of frost cracking is avoided.
Description
Technical field
The present invention relates to air-conditioning equipment and control technical field, being specifically related to a kind of recuperation of heat air-cooled heat pump cold-hot water system
System and method for controlling oil return thereof.
Background technology
Recuperation of heat air-cooled heat pump water chiller-heater units can solve air-conditioning and hot water demand simultaneously, the most increasingly by user
Welcome.In prior art, this type of unit is typically made up of three heat exchangers, in normal conditions, and general only two heat exchange
Device participates in refrigerant circulation, and surplus next heat exchanger is then in idle state, has when idle heat exchanger is in low-pressure side the biggest
Can stockpile a certain amount of compressor lubricant oil at bursting by freezing risk, and idle heat exchanger, this can be unfavorable to compressor operation.Separately
Outward, in prior art, the oil return scheme of this type of unit all uses timing and performs oil return, oil return operation and operating states of the units
Unrelated, it is impossible to accomplish on-demand oil return.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of heat that can protect heat exchanger and compressor stable operation and returns
Call prisoners in after letting them out for exercise cold-heat pump cold and hot water supply system, and a kind of related with operating states of the units for recuperation of heat air-cooled heat pump cold-hot water system
The method for controlling oil return of system.
The technical scheme is that, it is provided that a kind of recuperation of heat air-cooled heat pump cold-hot water system with following structure, it
Including compressor, gas-liquid separator, First Heat Exchanger, the second heat exchanger, heat recovering heat exchanger, the first cross valve, the second four-way
Valve and the 3rd cross valve；
The outlet of described compressor respectively with the first valve port of described first cross valve, the first valve of described second cross valve
Mouth, the first valve port connection of described 3rd cross valve, the entrance of described compressor and the outlet of described gas-liquid separator；
The entrance of described gas-liquid separator respectively with the 3rd valve port of described first cross valve, the of described second cross valve
Three valve ports, the 3rd valve port of described 3rd cross valve, the 4th valve port connection；
Second valve port of described first cross valve, described second cross valve the second valve port respectively with described second heat exchanger
The first valve port connection, and be provided with the first check valve on the pipeline that connects with described second heat exchanger of described first cross valve,
The water inlet of described first check valve connects with the second valve port of described first cross valve；
4th valve port of described first cross valve, described second cross valve the 4th valve port respectively with described First Heat Exchanger
The first valve port connection, and be provided with the second check valve on the pipeline that connects with described First Heat Exchanger of described second cross valve,
The water inlet of described second check valve connects with the 4th valve port of described second cross valve；
Described second valve port of the 3rd cross valve connects with the second valve port of described heat recovering heat exchanger, described first heat exchange
It is disposed with the first electronics swollen on the pipeline that second valve port of device connects with the second valve port of described second heat exchanger and connects
Swollen valve and the second electric expansion valve, the pipeline between described first electric expansion valve and described second electric expansion valve and described heat
Reclaim the first valve port connection of heat exchanger, and be provided with the 3rd electric expansion valve on the pipeline of connection；
3rd valve port of described heat recovering heat exchanger is communicated with on outlet pipe and described outlet pipe and is provided with water flow switch, institute
The 4th valve port stating heat recovering heat exchanger is communicated with water inlet pipe；
Described first cross valve keeps the first valve port and the connection of the 4th valve port and the second valve port and the 3rd in the first state
Valve port connects, and keeps the first valve port and the connection of the second valve port and the 3rd valve port and the connection of the 4th valve port in the second condition；Described
Second cross valve keeps the first valve port and the connection of the 4th valve port and the second valve port and the connection of the 3rd valve port in the first state, the
The first valve port and the connection of the second valve port and the 3rd valve port and the connection of the 4th valve port is kept under two-state；Described 3rd cross valve keeps
First valve port and the second valve port connection and the 3rd valve port and the 4th valve port connection.
Having the beneficial effect that of the technical program includes compressor, gas by arranging recuperation of heat air-cooled heat pump cold-hot water system
Liquid/gas separator, First Heat Exchanger, the second heat exchanger, heat recovering heat exchanger, the first cross valve, the second cross valve and the 3rd four-way
Valve, and each assembly is carried out above-mentioned connection, is equipped with the first check valve, the second check valve, the first electric expansion valve, the second electronics swollen
Swollen valve and the 3rd electric expansion valve carry out coolant control so that the heat exchanger that system is left unused in each mode is always at height
, there is not bursting by freezing risk in pressure side.
Further, described First Heat Exchanger is finned heat exchanger.
Further, described second heat exchanger is case tube heat exchanger.
Further, the water inlet pipe of described heat recovering heat exchanger is provided with into water temperature-sensitive bag, described heat recovering heat exchanger
Outlet pipe on water outlet temperature-sensitive bag is installed.
On the other hand, the present invention also provides for the method for controlling oil return of a kind of recuperation of heat air-cooled heat pump cold-hot water system, is suitable for
In carrying out oil return control for above-mentioned recuperation of heat air-cooled heat pump cold-hot water system, described method includes:
Step 1: the entrance at described compressor is provided for detecting the evaporating pressure sensor of refrigerant evaporation pressure, in institute
The outlet stating compressor is provided for detecting the condensing pressure sensor of coolant condensing pressure；
Step 2: control system enters refrigeration mode, closes described 3rd electric expansion valve and makes described heat recovering heat exchanger not busy
Put；Or, control system enters heating mode, closes described 3rd electric expansion valve and makes described heat recovering heat exchanger leave unused；Or
Person, control system enters refrigeration and adds hot-water mode, closes described first electric expansion valve and makes described First Heat Exchanger leave unused；Real
Time receive described evaporating pressure sensor and the evaporating pressure of described condensing pressure sensor senses and condensing pressure；
Step 3: when described evaporating pressure and described condensing pressure meet oil return condition, performs oil return action；
Wherein, described oil return condition includes: as described condensing pressure≤P0, if described evaporating pressure≤P1, simultaneously
The startup optimization time of described compressor reaches t1, and accumulated running time reaches t2；If P2 ＜ evaporating pressure≤P3, simultaneously
The startup optimization time of described compressor reaches t1, and accumulated running time reaches t3；If evaporating pressure ＞ P3, the most described
The startup optimization time of compressor reaches t1, and accumulated running time reaches t4；As described condensing pressure ＞ P0, compressor opens
The dynamic operation time reaches t1, and accumulated running time reaches t5；Wherein, the described startup optimization time is that described compressor is from start
Be continued for the time run, described accumulated running time be in the unit time period described compressor remain on state time
Between；
Described oil return action includes: control described 3rd electric expansion valve of closedown under associative mode or described first electricity
A period of time opened by sub-expansion valve.
Having the beneficial effect that of the technical program coordinates above-mentioned recuperation of heat air-cooled heat pump cold-hot water system, is evaporated by introducing
The accumulated running time of pressure, condensing pressure and compressor and these parameters of startup optimization time, come with operating states of the units
Control oil return to perform, it is ensured that the reliability service of compressor.
Further, described operation time t2, t3, t4, t5 meets t2 ＞ t3 ＞ t4 >=t5.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make
Accompanying drawing be briefly described, it should be apparent that, below describe in accompanying drawing be only some embodiments of the present invention, for
From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the structure chart of a kind of recuperation of heat air-cooled heat pump cold-hot water system；
Fig. 2 is a kind of recuperation of heat air-cooled heat pump cold-hot water system coolant flow graph in cooling mode；
Fig. 3 is a kind of recuperation of heat air-cooled heat pump cold-hot water system coolant flow graph in a heating mode；
Fig. 4 is the coolant flow graph that a kind of recuperation of heat air-cooled heat pump cold-hot water system adds under hot-water mode in refrigeration；
Fig. 5 is the flow chart of the method for controlling oil return of a kind of recuperation of heat air-cooled heat pump cold-hot water system.
Wherein, reference is:
1, compressor, 2, gas-liquid separator, 3, First Heat Exchanger, the 4, second heat exchanger, 5, heat recovering heat exchanger, 6, first
Cross valve, the 7, second cross valve, the 8, the 3rd cross valve, the 9, first check valve, the 10, second check valve, the 11, first electronic expansion
Valve, the 12, second electric expansion valve, the 13, the 3rd electric expansion valve, 14, water inlet temperature-sensitive bag, 15, water outlet temperature-sensitive bag.
Detailed description of the invention
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Referring to shown in Fig. 1～Fig. 5, the invention provides a kind of recuperation of heat air-cooled heat pump cold-hot water system, it includes pressure
Contracting machine 1, gas-liquid separator 2, First Heat Exchanger the 3, second heat exchanger 4, heat recovering heat exchanger the 5, first cross valve the 6, second four-way
Valve 7 and the 3rd cross valve 8；The outlet of compressor 1 respectively with the first valve port T1 of the first cross valve 6, the of the second cross valve 7
One valve port P1, the first valve port S1 connection of the 3rd cross valve 8, the entrance of compressor 1 and the outlet of gas-liquid separator 2；
The entrance of gas-liquid separator 2 respectively with the 3rd valve port T3, the 3rd valve port of the second cross valve 7 of the first cross valve 6
P3, the 3rd valve port S3 of the 3rd cross valve 8, the 4th valve port S4 connection；
Second valve port T2 of the first cross valve 6, the second cross valve 7 the second valve port P2 respectively with the of the second heat exchanger 4
One valve port X1 connection, and it is provided with the first check valve 9 on the pipeline that connects with the second heat exchanger 4 of the first cross valve 6, first is unidirectional
The water inlet of valve 9 and the second valve port T2 connection of the first cross valve 6；
4th valve port T4 of the first cross valve 6, the second cross valve 7 the 4th valve port P4 respectively with the of First Heat Exchanger 3
One valve port F1 connection, and on the pipeline that connects with First Heat Exchanger 3 of the second cross valve 7, it is provided with the second check valve 10, second singly
To water inlet and the 4th valve port P4 connection of the second cross valve 7 of valve 10；
Second valve port S2 of the 3rd cross valve 8 connects with the second valve port X2 of heat recovering heat exchanger 5, First Heat Exchanger 3
It is disposed with the first electric expansion valve on the pipeline of the second valve port F2 and the second valve port Y2 connection of the second heat exchanger 4 and connection
11 and second electric expansion valve 12, the pipeline between the first electric expansion valve 11 and the second electric expansion valve 12 and recuperation of heat heat exchange
First valve port X1 connection of device 5, and it is provided with the 3rd electric expansion valve 13 on the pipeline of connection；
3rd valve port X3 of heat recovering heat exchanger 5 is communicated with on outlet pipe and outlet pipe and is provided with water flow switch, recuperation of heat
4th valve port X4 of heat exchanger 5 is communicated with water inlet pipe；
First cross valve 6 keeps the first valve port T1 and the 4th valve port T4 connection and the second valve port T2 and the in the first state
Three valve port T3 connections, keep the first valve port T1 and the second valve port T2 connection and the 3rd valve port T3 and the 4th valve port in the second condition
T4 connects；Second cross valve 7 keeps the first valve port P1 and the 4th valve port P4 connection and the second valve port P2 and the in the first state
Three valve port P3 connections, keep the first valve port P1 and the second valve port P2 connection and the 3rd valve port P3 and the 4th valve port in the second condition
P4 connects；3rd cross valve 8 keeps the first valve port S1 and the second valve port S2 connection and the 3rd valve port S3 and the 4th valve port S4 connection.
Specifically, include compressor 1, gas-liquid separator 2, first change by arranging recuperation of heat air-cooled heat pump cold-hot water system
Hot device the 3, second heat exchanger 4, heat recovering heat exchanger the 5, first cross valve the 6, second cross valve 7 and the 3rd cross valve 8, and will be each
Assembly carries out above-mentioned connection, is equipped with first check valve the 9, second check valve the 10, first electric expansion valve the 11, second electric expansion valve
12 and the 3rd electric expansion valve 13 carry out coolant control so that the heat exchanger that system is left unused in each mode is always at height
, there is not bursting by freezing risk in pressure side.
Preferably, First Heat Exchanger 3 can be finned heat exchanger.Second heat exchanger 4 can be case tube heat exchanger.
Wherein in a kind of implementation, the water inlet pipe of heat recovering heat exchanger 5 is provided with into water temperature-sensitive bag 14, recuperation of heat
Water outlet temperature-sensitive bag 15 is installed on the outlet pipe of heat exchanger 5.
On the other hand, the present invention also provides for the method for controlling oil return of a kind of recuperation of heat air-cooled heat pump cold-hot water system, is suitable for
In carrying out oil return control for above-mentioned recuperation of heat air-cooled heat pump cold-hot water system, the method includes:
Step 1: the entrance at compressor 1 is provided for detecting the evaporating pressure sensor of refrigerant evaporation pressure, in compression
The outlet of machine 1 is provided for detecting the condensing pressure sensor of coolant condensing pressure；
Step 2: control system enters refrigeration mode, closes the 3rd electric expansion valve 13 and makes heat recovering heat exchanger 5 leave unused；Or
Person, control system enters heating mode, closes the 3rd electric expansion valve 13 and makes heat recovering heat exchanger 5 leave unused；Or, control system
Enter refrigeration and add hot-water mode, close the first electric expansion valve 11 and make First Heat Exchanger 3 leave unused；Real-time reception evaporating pressure passes
Sensor and the evaporating pressure of condensing pressure sensor senses and condensing pressure；
In other implementations, when control system enters water heating pattern, it is also possible to close the second electric expansion valve and make
Obtain the second heat exchanger to leave unused.
Step 3: when evaporating pressure and condensing pressure meet oil return condition, performs oil return action；
Wherein, oil return condition includes: as condensing pressure≤P0, if evaporating pressure≤P1, the simultaneously startup of compressor 1
The operation time reaches t1, and accumulated running time reaches t2；If P2 ＜ evaporating pressure≤P3, simultaneously the startup fortune of compressor 1
The row time reaches t1, and accumulated running time reaches t3；If evaporating pressure ＞ P3, simultaneously the startup optimization time of compressor 1
Reach t1, and accumulated running time reaches t4；As condensing pressure ＞ P0, the compressor 1 startup optimization time reaches t1, and accumulative
The operation time reaches t5；Wherein, the startup optimization time is the time that compressor 1 is continued for from start running, during accumulative operation
Between remain on time of state for unit time period inner compressor 1；
Oil return action includes: control the 3rd electric expansion valve 13 or the first electric expansion valve 11 closed under associative mode
Open a period of time.
Specifically, coordinate above-mentioned recuperation of heat air-cooled heat pump cold-hot water system, by introduce evaporating pressure, condensing pressure and
The accumulated running time of compressor 1 and these parameters of startup optimization time, control oil return with operating states of the units and perform, it is ensured that
The reliability service of compressor 1.
Further, above-mentioned operation time t2, t3, t4, t5 can meet t2 ＞ t3 ＞ t4 >=t5.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned enforcement
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications are also
Should be regarded as protection scope of the present invention.
Claims (6)
1. a recuperation of heat air-cooled heat pump cold-hot water system, it is characterised in that: include compressor, gas-liquid separator, the first heat exchange
Device, the second heat exchanger, heat recovering heat exchanger, the first cross valve, the second cross valve and the 3rd cross valve；
The outlet of described compressor respectively with the first valve port of described first cross valve, the first valve port of described second cross valve,
First valve port connection of described 3rd cross valve, the entrance of described compressor and the outlet of described gas-liquid separator；
The entrance of described gas-liquid separator respectively with the 3rd valve port, the 3rd valve of described second cross valve of described first cross valve
Mouth, the 3rd valve port of described 3rd cross valve, the 4th valve port connection；
Second valve port of described first cross valve, described second cross valve the second valve port respectively with the of described second heat exchanger
One valve port connection, and it is provided with the first check valve on the pipeline that connects with described second heat exchanger of described first cross valve, described
The water inlet of the first check valve connects with the second valve port of described first cross valve；
4th valve port of described first cross valve, described second cross valve the 4th valve port respectively with the of described First Heat Exchanger
One valve port connection, and it is provided with the second check valve on the pipeline that connects with described First Heat Exchanger of described second cross valve, described
The water inlet of the second check valve connects with the 4th valve port of described second cross valve；
Described second valve port of the 3rd cross valve connects with the second valve port of described heat recovering heat exchanger, described First Heat Exchanger
It is disposed with the first electric expansion valve on the pipeline that second valve port connects with the second valve port of described second heat exchanger and connects
With the second electric expansion valve, the pipeline between described first electric expansion valve and described second electric expansion valve and described recuperation of heat
First valve port connection of heat exchanger, and it is provided with the 3rd electric expansion valve on the pipeline of connection；
3rd valve port of described heat recovering heat exchanger is communicated with on outlet pipe and described outlet pipe and is provided with water flow switch, described heat
The 4th valve port reclaiming heat exchanger is communicated with water inlet pipe；
Described first cross valve keeps the first valve port and the connection of the 4th valve port and the second valve port and the 3rd valve port in the first state
Connection, keeps the first valve port and the connection of the second valve port and the 3rd valve port and the connection of the 4th valve port in the second condition；Described second
Cross valve keeps the first valve port and the connection of the 4th valve port and the second valve port and the connection of the 3rd valve port in the first state, at the second shape
The first valve port and the connection of the second valve port and the 3rd valve port and the connection of the 4th valve port is kept under state；Described 3rd cross valve keeps first
Valve port and the second valve port connection and the 3rd valve port and the 4th valve port connection.
A kind of recuperation of heat air-cooled heat pump cold-hot water system the most according to claim 1, it is characterised in that: described first heat exchange
Device is finned heat exchanger.
A kind of recuperation of heat air-cooled heat pump cold-hot water system the most according to claim 1, it is characterised in that: described second heat exchange
Device is case tube heat exchanger.
A kind of recuperation of heat air-cooled heat pump cold-hot water system the most according to claim 1, it is characterised in that: described recuperation of heat is changed
It is provided with on the water inlet pipe of hot device into water temperature-sensitive bag, the outlet pipe of described heat recovering heat exchanger is provided with water outlet temperature-sensitive bag.
5. the method for controlling oil return of a recuperation of heat air-cooled heat pump cold-hot water system, it is adaptable to for any one of Claims 1 to 4
Described recuperation of heat air-cooled heat pump cold-hot water system carries out oil return control, it is characterised in that described method includes:
Step 1: the entrance at described compressor is provided for detecting the evaporating pressure sensor of refrigerant evaporation pressure, in described pressure
The outlet of contracting machine is provided for detecting the condensing pressure sensor of coolant condensing pressure；
Step 2: control system enters refrigeration mode, closes described 3rd electric expansion valve and makes described heat recovering heat exchanger leave unused；
Or, control system enters heating mode, closes described 3rd electric expansion valve and makes described heat recovering heat exchanger leave unused；Or,
Control system enters refrigeration and adds hot-water mode, closes described first electric expansion valve and makes described First Heat Exchanger leave unused；In real time
Receive described evaporating pressure sensor and the evaporating pressure of described condensing pressure sensor senses and condensing pressure；
Step 3: when described evaporating pressure and described condensing pressure meet oil return condition, performs oil return action；
Wherein, described oil return condition includes: as described condensing pressure≤P0, if described evaporating pressure≤P1, the most described
The startup optimization time of compressor reaches t1, and accumulated running time reaches t2；If P2 ＜ evaporating pressure≤P3, the most described
The startup optimization time of compressor reaches t1, and accumulated running time reaches t3；If evaporating pressure ＞ P3, the most described compression
The startup optimization time of machine reaches t1, and accumulated running time reaches t4；As described condensing pressure ＞ P0, compressor start is transported
The row time reaches t1, and accumulated running time reaches t5；Wherein, the described startup optimization time is that described compressor is from starting shooting always
The time of continuous service, described accumulated running time is the time that described compressor remains on state in the unit time period；
Described oil return action includes: described 3rd electric expansion valve or described first electronics that control to close under associative mode are swollen
A period of time opened by swollen valve.
The method for controlling oil return of a kind of recuperation of heat air-cooled heat pump cold-hot water system the most according to claim 5, its feature exists
In: described operation time t2, t3, t4, t5 meets t2 ＞ t3 ＞ t4 >=t5.
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| CN107631519A (en) * | 2017-08-18 | 2018-01-26 | 珠海格力电器股份有限公司 | Air-conditioner set automatic oil return control method, device, storage medium and air-conditioner set |
| CN109297151A (en) * | 2018-10-22 | 2019-02-01 | 广东美的暖通设备有限公司 | Method for controlling oil return, device, storage medium and the air-conditioning system of air-conditioning system |
| CN109405353A (en) * | 2018-10-30 | 2019-03-01 | 广东美的暖通设备有限公司 | Method for controlling oil return and control system, storage medium and three control air-conditioning systems |
| CN109682117A (en) * | 2018-12-27 | 2019-04-26 | 浙江理工大学 | A kind of energy-saving cities and towns people place magnetic suspension compressor multi-connected machine and hot-water combined supplying system |
| CN110657505A (en) * | 2019-09-23 | 2020-01-07 | 广东芬尼克兹节能设备有限公司 | Dehumidifier system, dehumidifier and control method |
| CN113418317A (en) * | 2021-06-08 | 2021-09-21 | 瀚润联合高科技发展（北京）有限公司 | Ejection evaporation cooling type air-cooled heat pump unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631519A (en) * | 2017-08-18 | 2018-01-26 | 珠海格力电器股份有限公司 | Air-conditioner set automatic oil return control method, device, storage medium and air-conditioner set |
| CN109297151A (en) * | 2018-10-22 | 2019-02-01 | 广东美的暖通设备有限公司 | Method for controlling oil return, device, storage medium and the air-conditioning system of air-conditioning system |
| US11668504B2 (en) | 2018-10-22 | 2023-06-06 | Hefei Midea Heating AND Ventilating Equipment Co., Ltd. | Oil return control method and device of air conditioning system, storage medium and air conditioning system |
| CN109405353A (en) * | 2018-10-30 | 2019-03-01 | 广东美的暖通设备有限公司 | Method for controlling oil return and control system, storage medium and three control air-conditioning systems |
| CN109682117A (en) * | 2018-12-27 | 2019-04-26 | 浙江理工大学 | A kind of energy-saving cities and towns people place magnetic suspension compressor multi-connected machine and hot-water combined supplying system |
| CN110657505A (en) * | 2019-09-23 | 2020-01-07 | 广东芬尼克兹节能设备有限公司 | Dehumidifier system, dehumidifier and control method |
| CN113418317A (en) * | 2021-06-08 | 2021-09-21 | 瀚润联合高科技发展（北京）有限公司 | Ejection evaporation cooling type air-cooled heat pump unit |
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